Viscoelastic characterization of polyurea based polymers

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dc.contributor.advisorLiechti, K.M.
dc.contributor.advisorRavi-Chandar, K.
dc.creatorChakkarapani, Venkatasubbarao
dc.date.accessioned2016-11-17T14:54:01Z
dc.date.accessioned2018-01-22T22:31:06Z
dc.date.available2016-11-17T14:54:01Z
dc.date.available2018-01-22T22:31:06Z
dc.date.issued2007-05
dc.description.abstractSeveral formulations of sprayed polyurea were considered as an alternative to cast polyurea. Based on results from confined compression experiments on these materials, TRI – 25 was selected as the best alternative material on account of its good flow characteristics at lower stresses. The constitutive behavior of this formulation has been determined using confined relaxation and Arcan relaxation experiments. Bulk relaxation modulus and shear relaxation modulus were obtained in the form of Prony series. The thermal shift factor for bulk relaxation was fitted with the Arrhenius equation while for shear relaxation, the trend was fitted with the WLF equation. The nonlinear response at ambient conditions was predicted using the modified free volume model (Park et al., 2004). Calibration factors for the nonlinear model were obtained using bulk data from confined compression under ramp loading and Arcan shear. The prediction of uniaxial tensile test followed the experimental response closely while the compressive response followed it with stress and strain shifts, suggesting that the voids in the material could shift the compressive response of the material.en_US
dc.description.departmentMechanical Engineeringen_US
dc.format.mediumelectronicen_US
dc.identifierdoi:10.15781/T2J67905W
dc.identifier.urihttp://hdl.handle.net/2152/43768
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionRestricteden_US
dc.subjectSprayed polyureaen_US
dc.subjectCast polyureaen_US
dc.subjectCompressionen_US
dc.titleViscoelastic characterization of polyurea based polymersen_US
dc.typeThesisen_US
dc.type.genreThesisen_US

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